It is the purpose of this Article 17 to facilitate orderly development within North Carolina of banking organizations that have banking offices in more than one state. It is not the purpose of this Article to authorize acquisitions of North Carolina bank holding companies or North Carolina banks by bank holding companies that do not have their principal place of business in this State on any basis other than as expressly provided in this Article. Therefore, if any portion of this Article pertaining to the terms and conditions for and limitations upon acquisition of North Carolina bank holding companies and North Carolina banks by bank holding companies that do not have their principal place of business in this State is determined to be invalid for any reason by a final nonappealable order of any North Carolina or federal court of competent jurisdiction, then this entire Article shall be null and void in its entirety and shall be of no further force or effect from the effective date of such order: Provided, however, that any transaction that has been lawfully consummated pursuant to this Article prior to a determination of invalidity shall be unaffected by such determination. (1983 (Reg. Sess., 1984), c. 1113, s. 1; 1993, c. 175, s. 15; 1993 (Reg. Sess., 1994), c. 599, s. 1.)